fix: v2.5.3 — Windows workspace folders, picker on top, no console flashes

A workspace could not be created on Windows: "cwd must be an absolute path"
for D:\…, because createLane/canonicalCwd tested for a leading "/".

- lanes.js: path.isAbsolute/path.resolve; canonicalCwd stops at any root (a
  missing drive looped forever); resolveLaneByCwd and /ensure accept "\" too
- native-dialog.js: the Windows picker gets an invisible TopMost owner form,
  shown first — an ownerless dialog from the background server opened behind
  the browser, or hidden
- windows-hide.js: every child process on Windows starts with windowsHide,
  required first by the server and the detached scripts (a console window
  flashed per git/npm call)
- Confirm/update/clear-data modals and the quota panel scroll instead of
  overflowing a short window

server/__tests__/native-dialog.test.js

@@ -44,6 +44,16 @@ describe("native-dialog", () => {
     assert.ok(!args.slice(0, -2).join(" ").includes("shell script"));
   });
 
+  it("gives the Windows dialog a TopMost owner, so it does not open behind the browser", () => {
+    for (const kind of ["dir", "file"]) {
+      const [[cmd, args]] = nd.dialogCommands(kind, "C:\\x", "win32");
+      assert.equal(cmd, "powershell.exe");
+      const script = args.at(-1);
+      assert.match(script, /\$o\.TopMost = \$true;.*\$o\.Show\(\);.*\$d\.ShowDialog\(\$o\)/);
+      assert.ok(!script.includes("C:\\x"), "the folder travels in env, never the script");
+    }
+  });
+
   it(
     "answers the chosen path, null on Cancel, and falls through a missing program",
     {
@@ -95,10 +105,16 @@ describe("native-dialog", () => {
 
   it("tells a Cancel from a failure per program", () => {
     assert.equal(nd.isCancel("zenity", ""), true);
-    assert.equal(nd.isCancel("zenity", "Gtk-Message: GtkDialog mapped without a transient parent"), true);
+    assert.equal(
+      nd.isCancel("zenity", "Gtk-Message: GtkDialog mapped without a transient parent"),
+      true
+    );
     assert.equal(nd.isCancel("kdialog", "qt.qpa.xcb: could not connect to display :1"), false);
     assert.equal(nd.isCancel("osascript", "execution error: User canceled. (-128)"), true);
-    assert.equal(nd.isCancel("osascript", "execution error: No user interaction allowed. (-1713)"), false);
+    assert.equal(
+      nd.isCancel("osascript", "execution error: No user interaction allowed. (-1713)"),
+      false
+    );
     assert.equal(nd.isCancel("powershell.exe", ""), true);
     assert.equal(nd.isCancel("powershell.exe", "Add-Type : Cannot add type"), false);
   });